DOI: 10.1016/j.foreco.2016.08.029
Scopus记录号: 2-s2.0-84983483114
论文题名: Hydrologic and forest management controls on dissolved organic matter characteristics in headwater streams of old-growth forests in the Oregon Cascades
作者: Lee B.S. ; Lajtha K.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 380 起始页码: 11
结束页码: 22
语种: 英语
英文关键词: DOC
; DOM
; EEM
; Fluorescent
; Hydrology
; PARAFAC
Scopus关键词: Aerodynamics
; Aquatic ecosystems
; Biogeochemistry
; Biological materials
; Carbon
; Catchments
; Ecology
; Fluorescence
; Hydrology
; Organic compounds
; Proteins
; Quality control
; Soil moisture
; Soils
; Watersheds
; Dissolved organic matters
; Fluorescence excitation
; Fluorescent
; Fluorescent spectroscopy
; H.J. Andrews Experimental Forest
; PARAFAC
; Parallel factor analysis
; Specific uv absorbance
; Forestry
; agricultural catchment
; aquatic ecosystem
; biochemistry
; carbon cycle
; concentration (composition)
; dissolved organic carbon
; dissolved organic matter
; forest management
; headwater
; hydrology
; land classification
; microbial activity
; old-growth forest
; protein
; river
; soil horizon
; statistical analysis
; terrestrial ecosystem
; watershed
; Cascade Head
; Oregon
; United States
英文摘要: Dissolved organic matter (DOM) is a critical component of the carbon cycle linking terrestrial and aquatic ecosystems. Although many factors have been identified as influencing DOM fluxes and biochemical quality in rivers with varying land cover types, controls on DOM composition in forested headwater catchments of the western U.S. are poorly understood. This study examined the effect of hydrologic patterns and forest management history on stream DOM chemistry at watersheds located in the H.J. Andrews Experimental Forest of the Oregon Cascades. Specific UV absorbance at 254 nm (SUVA254), generally indicative of aromaticity, increased in streams during storms with increasing surficial soil horizon and litter DOM inputs. Fluorescence excitation and emission matrices (EEMs) with Parallel Factor Analysis (PARAFAC) identified a protein-like DOM fluorescent component as well as several other components associated with terrestrial plant material. Correlation analysis between the protein-like DOM component and hydrologic patterns, SUVA254, and DOC concentrations suggest that DOM during dry seasons represents more microbially-processed sources, such as protein-rich, deeper soil or DOM with greater in-stream microbial processing, compared to more plant-like surface soil sources observed during high flow. The base flow index (the proportion of base flow to total flow) showed a high correlation with the relative proportion of protein-like DOM indicating that deep soil water is a source of the protein-like signal. The relative proportions of the protein-like DOM and humic DOM were also influenced by the abundance of coarse woody debris (CWD), but not live tree biomass, with the proportions of protein-like DOM highest in harvested watersheds with low surficial CWD. This study shows UV and fluorescent spectroscopy is a viable finger printing method to elucidate DOM sources in pristine headwater streams at the western Cascades of Oregon. © 2016 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64698
Appears in Collections: 影响、适应和脆弱性
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作者单位: Water Resources Engineering, Oregon State University, 116 Gilmore Hall, Corvallis, OR, United States; Crop and Soil Science, Oregon State University, 3059 Ag Life Sciences Bldg, Corvallis, OR, United States
Recommended Citation:
Lee B.S.,Lajtha K.. Hydrologic and forest management controls on dissolved organic matter characteristics in headwater streams of old-growth forests in the Oregon Cascades[J]. Forest Ecology and Management,2016-01-01,380